* Sleep promotes the healing of wounds and boosts the immune system. People who don’t sleep well are more prone to contracting disease.

* Insufficient sleep leads to irritability, depression and headaches

* Sleep deprivation can adversely affect the brain’s cognitive function and memory. In addition, it affects the capacity to stay focused (leading to more traffic accidents for instance) as well as moral judgement.

* Sleep deprivation leads to irregular heart beat, increased risk of heart disease and strokes

* Lack of sleep leads to decreased body temperature during the day and the sensation of feeling constantly cold

* Continuous muscular activity without proper sleep leads to muscle aches and cramps

* A good quality sleep suppresses appetite. People that experience sleep deprivation usually gain weight as a result of an increase in appetite hormones.

* Extreme lack of sleep can even lead to hallucinations

* A sign of not enough sleep are blood shot eyes, eye bags (puffiness) and dark circles around the eyes